Nokia 6610 - Transmitter troubleshooting diagram

CCS Technical Documentation Troubleshooting Instructions
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Transmitter troubleshooting diagram
Check output signal level:
TX signal found ?
Yes
Tune
dead
start TX power level
Tune Tx DAC values
No
PA & ant switch
TX troubleshooting
TX OK
+32...+33dBm @897.4 MHz (GSM900)
+29...+30dBm @1747.8 MHz
(GSM1800 & GSM1900)
OK ?
Check
all power
levels,
OK ?
TX power
levels,
OK ?
No
Yes
No
Check output signal
on 500 MHZ span
Signal found on
incorrect frequency ?
Yes
Synthesizer
troubleshooting
Check with RF probe
signal level on
PA input >=0dBm (*
OK ?
Yes
HELGA
troubleshooting
No
Yes
tuning and check
tuned RAC values:
Highest level~700...900
Lowest level ~190...210
Base levle ~160...190
Major differences ?
Check with oscilloscope:
PA ctrl voltage
>1.5V peak OK ?
No
troubleshooting
No
Check control loop
components
OK ?
Replace HELGA
*(When 1kOhm passive probe is used,
correct the measurement result by +26dB
Replace
faulty
component(s)
Yes
Yes
Yes
Yes